package com.chanzany.principle.liskov.improve;

public class Liskov {
    public static void main(String[] args) {
        A a = new A();
        System.out.println("11-3="+a.func1(11,3));
        System.out.println("1-8="+a.func1(1,8));
        System.out.println("--------------------------");
        B b = new B();
        System.out.println("11-3="+b.func1(11,3));  //这里本意是求出11-3
        System.out.println("1-8="+b.func1(1,8));
        System.out.println("11-3+9="+b.func2(11,3));
    }
}
class Base{
    //把更加基础的方法和程序写入Base类
}

class A extends Base {
    public int func1(int a, int b){
        return a-b;
    }
}

class B extends Base{
    private final A a = new A();
    public int func1(int a, int b){
        return a+b;
    }
    public int func2(int a, int b){
        return func1(a,b)+9;
    }
    //我们仍然想使用A的方法
    public int func3(int a, int b){return this.a.func1(a,b);}
}
